Complete Program

Here is the complete program. The calculateMPG() method returns a double value to the caller. Since it returns a value, there must be a return statement within its body that returns a value of the correct type.

In the complete program, the calculateMPG() method uses the instance variables of its object to calculate miles per gallon.

import java.io.* ;

class Car
{
  // instance variables
  int startMiles;   // Stating odometer reading
  int endMiles;     // Ending odometer reading
  double gallons;   // Gallons of gas used 

  // constructor
  Car(  int first, int last, double gals  )
  {
    startMiles = first ;
    endMiles   = last ;
    gallons    = gals ;
  }

  // methods
  double calculateMPG()
  {
    return (endMiles - startMiles)/gallons ;
  }

}

class MilesPerGallon
{
  public static void main( String[] args ) 
  {
    Car car = new Car( 32456, 32810, 10.6 );
    System.out.println( "Miles per gallon is " 
        + car.calculateMPG() );
  }
}

QUESTION 11:

How many objects are in the system the very instant the program starts running?
How many objects are in the system just before the program stops running?

Click Here after you have answered the question